Well, the good news is that you seem to have a good working knowledge of some of the constraints and issues surrounding retirement. Retiring with financial security is challenging. But, you indeed have a very good base.To start, the biggest issue that I have not seen you address is healthcare. If you retire at age 57, health insurance may be a very very very substantial out of pocket cost. I strongly encourage you to investigate your healthcare options -- either by extending your employer's healthcare with Cobra or by purchasing private insurance. Medicare is not available to you until age 65. However, you may have veteran's benefits. Another resource for you is your local Veteran's Administration Office.To more specifically answer your questions:1) Yes, you should be able to leave your job without drawing on your 401k. However, it is probably a good idea to roll it over into an IRA. This article discusses many of the issues surrounding 401k Rollovers and I encourage you to review it: http://www.newretirement.com/Services/Rollover_Guide.aspx2 and 3) Withdrawals on a Traditional IRA (also known as distributions) can begin at age 59 1/2 and are mandatory by 70 1/2. (Withdrawals before age 59 and a half are usually subject to a 10 percent penalty.) So, you probably don't want to withdraw anything until that age.Retirement planning is not really something that you should do all on your own. It is just too risky. And, you have sufficient assets to warrent some outside help.NewRetirement offers a few services that may interest you. We have put together a matching calculator to help you find the right 401k Rollover product. Use the calculator here:https://www.newretirement.com/Services/Find_Rollover_3_Steps.aspxYou may also want to get matched to a Financial Planner:https://www.newretirement.com/Services/Professional_Financial_Advisors_Advice.aspxFinally, please review our general guide to retirement financial planning. It may make you more aware of some of the main issues you will be facing:http://www.newretirement.com/Services/Retirement_Risks.aspx